Wood preservative



' eral origin.

Patented Mar. 29, 1927.

KARL HEINRICH WOLMA'N, 0F BERLIN-GBUNEWALD, FRITZ IETEBS, OF BERLIN, AND

HANS runs,

0]? BEBLI'N-STEGLITZ, GERMANY.

WOOD PRESERVATIV'E.

n Drawin Application 111m January so, 1926, Serial no. 85,017, and in dermany January 2, 1926.

The object of the invention is a preservative for protecting'wood from the attack of destructive fungi and animal pests. been found that an extremely effective agent against the attack of fupgi as well as against the attack of animal organisms is obtained, if complex salts of tartaric acid with arsenic and an organic base are dissolved in suitable oils of; mineral origin. Such complex salts are for instance aniline arsenic tartrate C,,'H O-.As.C H NH,) pyridine arsenic tartrate (C,H,O. As.C H. N) quinoline arsenic tartrate (G4H3ORAS.C9H7N), strychnine arsenic tartrate (C,,H N O,.C H O As.H,O) etc.

In order to dissolve these compounds use can be made of the most varied oils of min- Such oils are for instance, suitable fractions of mineral oils, as well as oils from coal-tar. brown-coal tar, wood "tar,

.shale tar or low-temperature tars or also mixtures of these oils with one'another. The oils employed must preferably be aslittle volatile as possible and bodifiicult towash out of the wood. Moreover they must have a good capacity of dissolving the said compounds. It. is of course advantageous for the oils employed to be in themselves effective agents against destructive fungi cranimal pests. For this reason it is desirable to use coal tar oils or wood tar oils or other oils which are in themselves effective, or mixtures f the sa c with other oils.

Oth r compoun s or substances may be added tothe described preservatives. For instance suitable organic compounds, such as phenols. naphthols or also organic bases can be dissolved in the oils, as solvents for the mentioned of tartaric acid. compounds may also before the complex salts Moreover other suitable be dissolved in these oils dissolving of the complex It has 7 which are employed salts of tartaric acid, under .the condition that they do not produce any precipitates with the said complex salts. Such c0mpounds are for instance copper oleate, cop per naphthenate, lead oleate, mercury oleate. Similarly these additions may be made to the prepared solutions of complex salts of tartaric acid in the oils. Other suitable oils of mineral, vegetable or animal origin may be added to the oils,used for dissolving the arsenic compounds before or after the preparation of the solutions.

The oily preservatives composed in the "manner described may be used for impregnating the wood in any suitable manner, for instance according to the full-cell process or according to an empty-cell process, for example the R-uping process or according to any other suitable treatment, such as steeping, coating, spraying and the like. The impregnating agents are extremely stron poisons for the organisms in question an are also characterized by the per anency of their action. This is owing to t lieir slight volatility and to the difiicultyin washing out the dissolved substances by water, so that the preservatives are excellently adapted also for protecting wood agalnst pests-living in water.

What we claim is 1. A preservative for wood, consisting of an oil of mineral origin and of a complex salt of tartaric acid with arsenic and an organic base dissolved in it. a

2. A preservative for woods claimed in claim 1, and in which the said complex salt consists of quinoline arsenic tartrate.

In testimony whereof we affix our signa-' tures.

KARL HEINRICH WOLMAN. FRITZ PETERS. HANS PFLUG. 

